Did not see a channel to access to usb hard drive on wii menu

Hi, I am a newbie and after I follow all the instruction for install homebrew (4.2U) and usbloader, all went ok but I did not see a channel on wii menu to access to external harddrive and did not see anything on homebrew channel when I accessed into it. My usb harddrive is WD mybook 1.5TB, usbloader see it and did format to WBFS. Please help and thank you in advance